A lot of people seem to have problems with using fire and flames convincingly, so this is an account of how I created the fire effects in this particular image:
The techniques could be applied to any number of other pictures.
I used a single image of flames against a black background:
There are lots of such images freely available, and it is best to use a high quality one
with as close as possible to a totally black background.
If the flame image leaves a faint outline round the edge because the background
is not quite black, just use a large, soft-edged Eraser to get rid of it.
You could use several different flame images, but in this case it worked well with
This included the undersides of the arms, chin, nose and eyebrows of the figure and
the top surface of the well. I then experimented with the Opacity and Blend Modes to get
the right effect: Overlay and Soft Light seem to work best. In this case everything
was on an Overlay layer at full Opacity and the light on the figure was also duplicated
on a Screen layer at full Opacity to make it really strong - you need to experiment to
find the right effect.
I then used a small, soft-edged Brush to dot in the sparks.
This step could be done with an Adjustment layer, but I prefer to do it with a normal Overlay. I added the beam of white light from top right behind the figure to contrast with the fire and explain the white light on the top right of the original image: I painted it, blurred it, changed it to Screen mode and lowered the Opacity to about 30%. And that's it! I hope it is of some use.